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Phase Sequence Detector

Discussion in 'Electrical Engineering' started by Louis Bybee, Sep 2, 2003.

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  1. Louis Bybee

    Louis Bybee Guest


    I believe this matches your request.

  2. Zouie

    Zouie Guest

    Could Someone inform, or point me to a site that describes the circuit or
    the operation of a Phase Sequence Detector? I need to create a tools that
    can detect phase sequense in 3 phase....
    Pls , I need an idea....

    Thank You....

  3. Tom Grqyson

    Tom Grqyson Guest

    | Two lamps and a capacitor. And phasor diagrams! Most elegantly "Old
    | Oh that much else on the 'net was as well written.
    | --s falke

    I agree.

    I was very impressed after my mind had already started thinking
    about Zero crossing detectors and set / reset latches and such.

    Makes me wonder if a design like this was planned from the start or
    discovered by accident.

    Tom Grayson
  4. Tom Grqyson

    Tom Grqyson Guest

    | Another 'old school' is a tiny three-phase reluctance motor with three
    | leads attached. It helps if you paint a disk or something on the shaft so
    | you can easily hypnotize yourself ;-)
    | daestrom

    True, But I think the "Two lamps and a capacitor" wins "hands down"
    on the grounds of simplicity and ease of construction.

    but, to be fair, I have not seen the "Two lamps and a capacitor" work.
    I do know the little motor leaves absolutely no doubt :eek:)

  5. Don Kelly

    Don Kelly Guest

    Both work quite nicely:
    The motor type was produced commercially - looked like an oversized hockey
    puck with alittle window to view a rotating disc -probably was multipole and
    low torque so the disc movement could be seen as other tha a blur. The
    lamp/capacitor scheme also works nicely and is easy to build (and cheaper).
    I remember these from about 50 years ago.
  6. daestrom

    daestrom Guest

    Yup. That's the type I was thinking of. Cut one open one time (it had
    stopped working). Just a small set of coils on a small section of stator
    iron (just a small arc of the complete circle). Gave it the 'effect' of
    having multiple poles, just not a lot of torque (don't need it to spin the

  7. Ben Miller

    Ben Miller Guest


    It is still standard equipment for the utility meter guys around here. It
    also serves as a work light in a dark vault!

    Ben Miller
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